You should always be able to do non-destructive editing even when pretending to work destructively, by keeping around the original sources (which you keep aroun

You should always be able to do non-destructive editing even when pretending to work destructively, by keeping around the original sources (which you keep around anyway in most cases) and the graph of operations applied (which isn't much data). Or rather, the software should be able to do that. I'm surprised that there don't seem to be any applications doing that.